Question

我在Coin.java类中设置了一个for循环，由正在运行的程序CoinTossing.java调用......出于某种原因，for循环被忽略了，我不确定为什么。任何提示将非常感谢！谢谢。

Coin.java（方法在哪里！）

import static java.lang.System.exit;
import static java.lang.System.in;
import static java.lang.System.out;
import java.util.Random;
import java.util.Scanner;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Kiora Lizet
 */
public class Coin 

{

//Enumeration with representation of coin state.
private enum Status {HEADS, TAILS};

//Constants that represent flip outcome
private static final int HEADSCOUNT = 0;
private static final int TAILSCOUNT = 1;

//Random number function.
private static final Random randomNumbers = new Random();

//Method to flip a coin and return the output.

Status coinState; //Contains the orientation of the coin, heads or tails.

int numberOfHeads = 0;  //Couinter for number of heads.
int numberOfTails = 0;  //Counter for number of tails. 
public int flip()
{
    int outcome = randomNumbers.nextInt(2);
    return outcome;
}

//Method to ask the user for their decisions on coin flips.
public int decision()
{

    int Flips = 1;
    Scanner input = new Scanner(in); 
    int flipDecision;
    do
    {
        out.print("Enter 1 to flip the coin. Enter 2 to select the amount "
                + "of flips. (0 or below to stop): ");
        flipDecision = input.nextInt(); //Grabs decision

        if(flipDecision <= 0)       //Exit the program. 
            exit(0);

        if(flipDecision >= 3)       //Reruns loop.
        {
            out.print("Enter a correct decision.\n");
        }
    }while (flipDecision >= 3);

    if(flipDecision == 2)
    {
        out.print("Please insert the number of flips desired: ");
        Flips = input.nextInt();
    }
    return Flips;
}        

//Method to store coins flipped.
public void coinsFlipped(int Flips)
{
for(int i = 0; i == Flips; ++i)
    {
        int outcome = flip();

        switch (outcome)
        {
            case HEADSCOUNT: //Get a counter for one heads value.
                out.print("Heads!");
                coinState = Status.HEADS;
                break;
            case TAILSCOUNT: //Get a counter for one tails value.
                out.print("Tails!");
                coinState = Status.TAILS;
                break;
        }

        if(coinState == Status.HEADS)
        {
            ++numberOfHeads;
            out.printf("/nThere are currently %d repetitions of Heads.", 
                    + numberOfHeads);
        }
        if(coinState == Status.TAILS)
        {
            ++numberOfTails;
            out.printf("\nThere are currently %d repetitions of Tails.", 
                    + numberOfTails);
        }
    }
}

}

CoinTossing.java（将方法放在一起的地方！）

import static java.lang.System.exit;
import static java.lang.System.in;
import static java.lang.System.out;
import java.util.Scanner;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Kiora Lizet
 */
public class CoinTossing 
{

    //Enumeration with representation of coin state.
    private enum Status {HEADS, TAILS};

    //Constants that represent flip outcome
    private static final int HEADSCOUNT = 0;
    private static final int TAILSCOUNT = 1;

    public static void main (String[] args)
    {

        Scanner input = new Scanner(in);
        Coin Token = new Coin(); //For functions, object declaration.

        int continuation; //Variable to decide for more flips.


        do
        {            
        int Flips = Token.decision();
        Token.coinsFlipped(Flips);
        //Variable declared for amount of flips.
        out.printf("Flips: %d", Flips);

        out.print("\nWould you like to flip more coins? \nInsert 1 to do so." 
                + " Enter any other number to exit program.\n");
        continuation = input.nextInt();
        }while(continuation == 1);
    }
}

Answer 1

您的for循环终止条件有问题。这样：

for(int i = 0; i == Flips; ++i)

如果Flips的值不是0，

将仅在第一次迭代时终止。它应该替换为：

for(int i = 0; i <= Flips; ++i)

Answer 2

您的for循环 for(int i = 0; i == Flips; ++i) 每当Flips不为零时终止。

如果要求进行零翻转或负翻转，可能是循环应该在第一次迭代之前终止，这样就不会发生翻转。否则，循环应执行Flips次。

您可以通过在for循环中具有以下条件来执行此操作：
for(int i = 0; i < Flips ; ++i)

对于嵌套在里面的循环做...而不起作用

2 个答案: